I'm new on here and just building my first RC plane, an Art-Tech Cessna 182. I built is as per the instructions in the pack, making sure I connected the servo cables correctly. Once I had it built, I connected the battery and found the following...

The rudder works fine
The elevators work fine
The LHS aerilon descends and stays there, even when the battery is disconnected. I had to undo the pushrod in case it damaged the foam
The RHS aerilon doesn't respond
The flaps don't respond.

I have double and triple checked that the connectors are connected properly, and they are...

Any help is appreciated as all I want to do is get it in the air after practising on the sim.